support for exact array sizes

[mreinstein]

some APIs will operate on an entire array, and the length needs to be exact. The adjusted API could look like:

var pool = require("typedarray-pool")

// Allocate a buffer of 93 bytes
var exactSize = true
var f = pool.malloc(93, "uint8", exactSize)

// f.byteLength === 93

// When done, release buffer
pool.free(f)

exactSize would default to false, to avoid breaking the existing API.

@mikolalysenko would you be open to a PR for this?

[mreinstein]

I'm still keen to write this if there's a willingness to merge it

[mikolalysenko]

👍

[mreinstein]

@mikolalysenko I have a PR that is just about ready for this, but I have several questions, which overlap some of the other issues in this tracker. Would you be available to chat on slack or some other more real-time medium? Probably faster than going back and forth in github messaging.